I suspect that there is a switching problem to the meter that is not working. The meter is shared with other fuctions on the amp, and there is quite a signal path/switch array connecting it. I would suggest tweaking rotary switches(particularly dolby related) to see if you can isolate the problem down to a particular one, then give it a clean with CRC2-26

I have the service manual I you want a copy. Just let me know.

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If the fuse was blown on the 220-250 V side, I am assuming that you are in the UK, if you aren't , but are in the US, change the power setting dial/switch on the back to 100-120v and you might be good to go. Also, I know this may sound silly, but make sure that the speaker selector switch is pressed in or set to a speaker set ( A or B). Love the Sansui gear, have many complete systems myself!

Fuses blow when there's an overload. This is often caused by the main power amp devices located on the heat sink. If they are transistors you can test them with an ohm meter. It will be just like you have put the two test probes together on the separate pins of the device.

The outputs are probably shorted. This unit requries service. I can say though, that once repaired, you will love this unit. Expecta repair cost inteh $150-$200 range. It is worthy it. If the unit is in good condition (appearance), than it is worth $400+ when working.

This sounds like you lost the 5V supply. If you can solder, look for bad solder connections around the voltage regulator ICs. These look like transistors (3 legs) and may be attached to a heatsink. They will be marked 7805 +/or 7905.
Dan